Suction-extraction device for a demolition hammer

ABSTRACT

Suction-extraction device for a demolition hammer, wherein the demolition hammer has a housing and a tool fitting for receiving a demolition chisel, wherein the suction-extraction device has a flexible suction hose on whose free end there is connected a suction body via which dust is to be sucked up from a working region of the demolition chisel, wherein the suction-extraction device has a fastening element by which the suction hose can be mounted on the housing of the demolition hammer at a fastening point of the suction hose that is spaced apart from the free end, with the result that, during suction operation, the suction body can be freely pivoted with respect to the demolition chisel, at least in the radial direction.

The present invention relates to a suction-extraction device for a demolition hammer, wherein the demolition hammer has a housing and a tool fitting for receiving a demolition chisel. The suction-extraction device is equipped with a flexible suction hose on whose free end there is connected a suction body. Dust can be sucked up from a working region of the demolition chisel via the suction body.

BACKGROUND

Suction-extraction devices of this kind are known in principle from the prior art. Thus, during heavy demolition work, use is made for example of a suction body in the form of a suction sleeve which is fitted over the demolition chisel.

SUMMARY OF THE INVENTION

It is an object of the present invention to provide a suction-extraction device which promotes safe operation for the user.

The present invention provides that the suction-extraction device has a fastening element by means of which the suction hose can be mounted on the housing of the demolition hammer at a fastening point of the suction hose that is spaced apart from the free end, with the result that, during suction operation, the suction body can be freely pivoted with respect to the demolition chisel, in particular in the radial direction. It has proved to be advantageous if the fastening point of the suction hose defines a pivot point around which the suction hose together with suction body can be pivoted.

The invention includes the finding that it is disadvantageous with suction-extraction devices of the prior art that the suction body has to be fitted over the demolition chisel. The disadvantage lies in the fact that, if, for example, chiseling over an edge or into the extracted material occurs, the suction-extraction body can fall down and even be destroyed. A further disadvantage lies in the fact that the user's view of a cutting edge of the demolition chisel is prevented or at least considerably restricted. Furthermore, with increasing wear of the demolition chisel, use of the suction-extraction body is typically no longer possible since it can slip down from the demolition chisel.

By contrast thereto, there is provision according to the invention for an improved suction-extraction device whose suction body during suction operation can be freely pivoted with respect to the demolition chisel, at least in the radial direction. This has the crucial advantage of at all times making it possible to have a free view of the demolition chisel, which is important in particular in the case of a heavy demolition hammer. User safety is considerably increased as a result. The possibility of pivoting the suction body relative to the demolition chisel additionally prevents a situation in which the suction-extraction body slips axially toward the demolition chisel or is even destroyed. Specifically, it has proved practically impossible to jam the suction-extraction body when chiseling for instance on an edge or in the extracted material. As a result, continuous suction-extraction of dust from the working region of the demolition chisel—and hence also the health of the user—is ensured at all times.

In a particularly preferred embodiment, the fastening element takes the form of a retaining clip (spring clip). It has proved to be advantageous if the retaining clip has an eye which is designed to preferably completely clamp around the suction hose. In a further preferred embodiment, a diameter of the eye can be widened by a manual actuation, preferably in such a way that the eye can be displaced along a length of the suction hose. It is thus possible as a result for the position, in particular the axial position, of the suction body to be changed relative to the demolition chisel. Thus, the position of the suction body can be simply adjusted to any wear of the demolition chisel. It has proved to be advantageous if a manual actuation occurs counter to spring preloading applied by the retaining clip.

It has proven to be advantageous if the retaining clip has two holding arms. In a particularly preferred embodiment, the holding arms are designed to engage in two mounting openings in the housing of the demolition hammer. A mounting opening can be, for example, a cutout in the housing in which, for example, a housing screw is sunk. In a particularly preferred embodiment, the already described spring preloading applied by the retaining clip serves to hold the holding arms in the respective mounting opening. In a further preferred embodiment, a further fastening element in the form of a retaining clip is provided.

In a further preferred embodiment, the suction body has a suction dome. The suction dome can have a suction slot which extends in the axial direction along the suction dome. In a particularly preferred embodiment, the suction slot opens into a suction channel situated in the interior of the suction dome. It has proved to be advantageous if the suction dome has a plurality of suction slots. In a particularly preferred embodiment, the suction slots are arranged uniformly spaced apart from one another along a circumferential direction of the suction dome. In a further preferred embodiment, each of the suction slots opens into a respective suction channel.

In a likewise preferred embodiment, the suction body has a carrier piece to which the suction hose can be fastened on one side and the suction dome on the other side. It has proved to be advantageous if the suction channels for their part open into a connection region of the carrier piece. In a particularly preferred embodiment, the connection region of the carrier piece opens into the suction hose. It has proved to be advantageous if the carrier piece has a plurality of latching lugs which are arranged uniformly spaced apart from one another along the circumferential direction of the carrier piece. The carrier piece can be re-releasably connected to the suction dome by means of the latching lugs.

It has furthermore proved to be advantageous if the carrier piece has an internal thread into which the suction hose can be screwed. In a particularly preferred embodiment, the suction dome and the carrier piece are joined to one another, for example via a press fit. It has proved to be advantageous if the suction dome and the carrier piece are designed as different components. The suction dome and the carrier piece can be provided in one piece, for example by means of an additive manufacturing method. It has proved to be advantageous if, during the intended suction operation, the suction body does not enclose the demolition chisel.

The invention is also achieved by the use of a suction-extraction device of the above-described type for sucking up dust from a working region of a demolition chisel which is received in a tool fitting of a demolition hammer.

Subject matter which can be protected independently is provided by a suction-extraction device for an electric hand-held power tool, wherein the electric hand-held power tool has a housing and a tool fitting for receiving a tool, wherein the suction-extraction device has a flexible suction hose on whose free end there is connected a suction body via which dust is to be sucked up from a working region of the tool, and wherein the suction-extraction device has a fastening element by means of which the suction hose can be mounted on the housing of the electric hand-held power tool at a fastening point of the suction hose that is spaced apart from the free end, with the result that, during suction operation, the suction body can be freely pivoted with respect to the tool, at least in the radial direction.

Further advantages will become apparent from the following description of the figures. Various exemplary embodiments of the present invention are illustrated in the figures. The figures, the description and the claims contain numerous features in combination. A person skilled in the art will expediently also consider the features individually and combine them to form useful further combinations.

BRIEF DESCRIPTION OF THE DRAWINGS

Identical and similar components are denoted by the same reference signs in the figures, in which:

FIG. 1 shows a first preferred exemplary embodiment of a suction-extraction device;

FIG. 2 shows a fastening element of the suction-extraction device of FIG. 1 ;

FIG. 3 shows the suction-extraction device of FIG. 1 with two fastening elements;

FIG. 4 shows a suction body of the suction-extraction device of FIG. 1 ; and

FIGS. 5A and 5B show an exploded illustration of the suction body of FIG. 4 .

DETAILED DESCRIPTION

A first preferred exemplary embodiment of a suction-extraction device 100 according to the invention is illustrated in FIG. 1 . The suction-extraction device 100 is arranged on a heavy demolition hammer 200. The demolition hammer 200 can also be referred to as a chisel hammer or floorbreaker. The demolition hammer 200 has a housing 210 and a tool fitting 220. In the tool fitting 220 there is situated a demolition chisel 250 for chiseling work along the axial direction AR. The suction-extraction device 100 has a flexible suction hose 10 with a diameter of approximately 35 mm. A suction body 20 is connected to a free end 11 of the suction hose 10. Dust can be sucked up from a working region AB of the demolition chisel 250 via the suction body 20 and the suction hose 10. This is achieved, for example, by means of a construction site vacuum cleaner.

The suction-extraction device 100 has a fastening element 30 by means of which the suction hose 10 is mounted on the housing 210 of the demolition hammer 200. Here, the fastening element 30 is mounted at a fastening point 13 of the suction hose 10 that is spaced apart from the end 11 of the suction hose 10. Consequently, during suction operation, the suction body 20 can be freely pivoted with respect to the demolition chisel 250, at least in the radial direction RR. This has the crucial advantage of at all times making it possible to have a free view of the demolition chisel 250, which is important in particular in the case of the heavy demolition hammer 200 of FIG. 1 . The fastening point 13 defines a pivot point SP around which the suction hose 10 together with suction body can be pivoted.

As can be gathered from FIG. 1 , the fastening element 30 takes the form of a retaining clip 31 (cf. FIG. 2 ). The retaining clip 31 has an eye 33 which is designed to completely clamp around the suction hose 10. A diameter DM of the eye 33 (cf. FIG. 2 ) can be widened by a manual actuation such that the eye 33 can be displaced along a length LS of the suction hose 10. The position of the suction body 20 in the axial direction AR relative to the demolition chisel 250 can thus be changed. The retaining clip 31 has two holding arms 35 which are designed to engage in two mounting openings 211 (only one of these can be seen in FIG. 1 ) in the housing 210 of the demolition hammer 200. In the presently illustrated exemplary embodiment, the mounting openings 211 are a cutout in the housing 210 in which a housing screw is sunk. It can clearly be seen in FIG. 1 that the suction body 20 has a suction dome 21 which has at least one suction slot 23 which extends in the axial direction AR along the suction dome 21.

With reference to FIG. 2 , the fastening element 30 of the suction-extraction device 100 of FIG. 1 will now be more precisely explained. The fastening element 30 takes the form of a retaining clip 31. FIG. 2A shows a plan view of the retaining clip 31 (view from “above” in the axial direction AR in FIG. 1 ). FIG. 2B shows a side view of the retaining clip 31, and FIG. 2C shows a perspective view. The circular eye 33 of the retaining clip 31 is designed to completely clamp around the suction hose 10 (cf. FIG. 1 ). The diameter DM of the eye 33 is, by way of example, 35 mm and is tailored to a diameter of the suction hose 10.

The eye 33 of the retaining clip 31 extends on both sides into a respective holding arm 35. The holding arms are provided to engage in two mounting openings 211 in the housing 210 of the demolition hammer 200 (cf. FIG. 1 ). The eye 33 can be widened by a manual actuation force HF (thick solid arrows in FIG. 2A). The “forced-open” eye 33 thus widened for example to a diameter DM of 45 mm can be displaced as desired along the suction hose. Here, the manual actuation force HF is applied counter to a preloading force VF (thick dashed arrows in FIG. 2A). The retaining clip 31, which can, for example, be bent in one piece from a spring steel, can be produced in a technically ingeniously simple and comparatively cost-effective manner.

FIG. 3 illustrates the suction-extraction device 100 of FIG. 1 proportionately, wherein the suction hose 10 is held with an additional fastening element 30′ which engages in a further mounting opening 211′ on the housing 210. The additional fastening element 30′ is structurally identical to the fastening element 30 and also is in the form of a retaining clip 31′. However, the additional fastening element 30′ does not define an additional pivot point for the suction hose 10, but serves only for the (additional) securement of the suction hose 10 on the housing 210 at a second fastening point 13′.

FIGS. 4 and 5A and 5B show the suction body 20 in detail. In the present case, the suction body 20 is, by way of example, constructed in two parts and has a suction dome 21 and a carrier piece 27. As can be gathered from FIG. 4 , the suction dome 21 has a plurality of suction slots 23 which are arranged uniformly spaced apart from one another along a circumferential direction UR of the suction dome 21. Dust can be sucked up via these suction slots 23. Comparatively large fragments cannot pass through these suction slots 23. At its end side, the suction dome 21 has a plurality of suction apertures 24 which for their part are arranged uniformly spaced apart from one another along the circumferential direction UR of the suction dome 21.

It can clearly be seen in FIG. 5B that each of the suction slots 23 opens into a respective suction channel 25 formed in the interior of the suction dome 21. In the center of the suction dome 21 there is arranged a central connection region 28 into which all of the suction channels 25 open. Centrally in the carrier piece 27 there is formed a corresponding connection region 28′ in which, during suction operation, dust is conducted to the suction hose (not shown). The suction hose itself is screwed into an internal thread 29 of the carrier piece 27. As can also be gathered from FIG. 5 , the carrier piece 27 has a plurality of latching lugs 26 which are arranged uniformly spaced apart from one another along the circumferential direction UR. The carrier piece 27 can be re-releasably connected to the suction dome 21 by means of the latching lugs 26. The suction body 20 formed by the suction dome 21 and the carrier piece 27 does not enclose the demolition chisel 250 during the intended suction operation.

LIST OF REFERENCE SIGNS

-   -   10 Suction hose     -   11 Free end of the suction hose     -   13, 13′ Fastening point     -   20 Suction body     -   21 Suction dome     -   23 Suction slots     -   24 Suction aperture     -   25 Suction channel     -   26 Latching lugs     -   27 Carrier piece     -   28′ Connection region     -   29 Internal thread     -   30, 30′ Fastening element     -   31, 31′ Retaining clip     -   33 Eye     -   35 Holding arms     -   100 Suction-extraction device     -   200 Demolition hammer     -   210 Housing     -   211, 211′ Mounting opening     -   220 Tool fitting     -   250 Demolition chisel     -   AB Working region     -   AR Axial direction     -   DM Diameter     -   HF Manual actuating force     -   LS Length of the suction hose     -   RR Radial direction     -   SP Pivot point     -   UR Circumferential direction     -   VF Preloading force 

1-12. (canceled)
 13. A suction-extraction device for a demolition hammer having a housing and a tool fitting for receiving a demolition chisel, the suction-extraction device comprising: a flexible suction hose; a suction body connected to a free end of the suction hose and for sucking up dust from a working region of the demolition chisel; and a fastener, the suction hose mountable on the housing of the demolition hammer at a fastening point of the suction hose via the fastener, the fastening point of the suction hose being spaced apart from the free end so that, during suction operation, the suction body is pivotable with respect to the demolition chisel.
 14. The suction-extraction device as recited in claim 13 wherein the suction body is pivotable in a radial direction.
 15. The suction-extraction device as recited in claim 13 wherein the fastening element is in the form of a retaining clip.
 16. The suction-extraction device as recited in claim 15 wherein the retaining clip has an eye designed to clamp around the suction hose
 17. The suction-extraction device as recited in claim 16 wherein the eye clamps around the suction hose completely.
 18. The suction-extraction device as recited in claim 16 wherein a diameter of the eye is widenable by a manual actuation so that the eye is displaceable along a length of the suction hose.
 19. The suction-extraction device as recited in claim 15 wherein the retaining clip has two holding arms designed to engage in two mounting openings in the housing of the demolition hammer.
 20. The suction-extraction device as recited in claim 13 wherein the suction body has a suction dome.
 21. The suction-extraction device as recited in claim 20 wherein the suction dome has a suction slot extending in an axial direction along the suction dome.
 22. The suction-extraction device as recited in claim 21 wherein the suction slot opens into a suction channel situated in an interior of the suction dome.
 23. The suction-extraction device as recited in claim 20 wherein the suction dome has a plurality of suction slots arranged uniformly spaced apart from one another along a circumferential direction of the suction dome, wherein each of the suction slots opens into a respective suction channel.
 24. The suction-extraction device as recited in claim 20 wherein the suction body has a carrier piece, the suction hose fastenable on one side to the carrier piece and to the suction dome on the other side.
 25. The suction-extraction device as recited in claim 13 wherein, during the intended suction operation, the suction body does not enclose the demolition chisel.
 26. A method for operating the suction-extraction device as recited in claim 13 comprising using the suction-extraction device to suck up dust from the working region of the demolition chisel received in the tool fitting of the demolition hammer. 